Add Default impl for Cell

Just a bit of cleanup.

src/term/cell.rs

@@ -36,6 +36,17 @@ pub struct Cell {
     pub flags: Flags,
 }
 
+impl Default for Cell {
+    fn default() -> Cell {
+        Cell::new(
+            ' ',
+            Color::Named(NamedColor::Foreground),
+            Color::Named(NamedColor::Background)
+        )
+    }
+
+}
+
 /// Get the length of occupied cells in a line
 pub trait LineLength {
     /// Calculate the occupied line length
@@ -100,11 +111,10 @@ mod tests {
 
     use grid::Row;
     use index::Column;
-    use ansi::Color;
 
     #[test]
     fn line_length_works() {
-        let template = Cell::new(' ', Color::Indexed(0), Color::Indexed(0));
+        let template = Cell::default();
         let mut row = Row::new(Column(10), &template);
         row[Column(5)].c = 'a';
 
@@ -113,7 +123,7 @@ mod tests {
 
     #[test]
     fn line_length_works_with_wrapline() {
-        let template = Cell::new(' ', Color::Indexed(0), Color::Indexed(0));
+        let template = Cell::default();
         let mut row = Row::new(Column(10), &template);
         row[Column(9)].flags.insert(super::WRAPLINE);
 

src/term/mod.rs

@@ -277,11 +277,7 @@ impl SizeInfo {
 
 impl Term {
     pub fn new(size: SizeInfo) -> Term {
-        let template = Cell::new(
-            ' ',
-            Color::Named(NamedColor::Foreground),
-            Color::Named(NamedColor::Background)
-        );
+        let template = Cell::default();
 
         let num_cols = size.cols();
         let num_lines = size.lines();
@@ -1040,7 +1036,6 @@ mod tests {
 
     use super::limit;
 
-    use ansi::{Color, NamedColor};
     use grid::Grid;
     use index::{Line, Column};
     use term::{Cell};
@@ -1051,11 +1046,7 @@ mod tests {
     /// test this property with a T=Cell.
     #[test]
     fn grid_serde() {
-        let template = Cell::new(
-            ' ',
-            Color::Named(NamedColor::Foreground),
-            Color::Named(NamedColor::Background)
-        );
+        let template = Cell::default();
 
         let grid = Grid::new(Line(24), Column(80), &template);
         let serialized = serde_json::to_string(&grid).expect("ser");